While many AV components, like TVs and Blu-ray players, keep getting smaller, subwoofers keep getting bigger. A decade ago a 12" subwoofer was considered large but in the world of 15" and even dual 18" drivers those now seem quaint in comparison.
Impeccable build quality; fantastic integration with speakers for musical bass; more than enough power to fill a normal sized room
Integrated EQ should be automated